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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1e894b2486fae7e09e2ec9d95d304a249700a27102bc90efc8e035046c3145' 
  AND token = 'wSDPS4YR3N+7ARoJ9Rkr9qcbT5tPRzqjL04NII3s1Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}